未捕获的TypeError：无法读取未定义的属性'getCurrentPosition'

Question

我写了一个混合应用程序。我使用cordova地理位置插件来选择位置数据。调用AlarmOn（）时出现错误；通过setTimeout。这是我的代码：

else if (response.status === "Tega201") {
                            ons.notification.alert(response.message);
                            const navigator = document.querySelector('#navigator');
                            navigator.resetToPage('teguaPage.html');
                            var tega_end_time = response.tega_end_time;
                            var deadline = new Date(tega_end_time).getTime();
                            const alarmON = () =>{
                                function getPosition() {
                                    var options = {
                                        enableHighAccuracy: true,
                                        maximumAge: 3600000
                                    }
                                    var watchID = navigator.geolocation.getCurrentPosition(onSuccess, onError, options);

                                    function onSuccess(position) {
                                        var longitude = String(position.coords.longitude);
                                        var latitude = String(position.coords.latitude);
                                        var phone_number = String(storage.getItem('phone_number'));

                                        var submitAlarmOnLocation = {
                                            "async": true,
                                            "crossDomain": true,
                                            "url": serverUrl + 'alarm_on_location_reporting/',
                                            "method": "POST",
                                            "headers": {
                                                "Accept": "*/*",
                                                "Content-Type": "application/json; charset=UTF-8",
                                            },
                                            "processData": false,
                                            "data": "{\n\t\"phone_number\": \"" + phone_number + "\",\n\t\"latitude\":\"" + latitude + "\",\n\t\"longitude\":\"" + longitude + "\"\n}"
                                        }

                                        $.ajax(submitAlarmOnLocation).done(function(response){
                                            ons.notification.alert(response);
                                        });
                                    };

                                    function onError(error) {
                                        ons.notification.alert('code: ' + error.code + '\n' + 'message: ' + error.message + '\n');
                                    }
                                }
                                getPosition();
                            } 
                            var x = setInterval(function() { 
                                var now = new Date().getTime(); 
                                var t = deadline - now; 
                                var days = Math.floor(t / (1000 * 60 * 60 * 24)); 
                                var hours = Math.floor((t%(1000 * 60 * 60 * 24))/(1000 * 60 * 60)); 
                                var minutes = Math.floor((t % (1000 * 60 * 60)) / (1000 * 60)); 
                                var seconds = Math.floor((t % (1000 * 60)) / 1000); 
                                    if (t < 0) { 
                                        console.log("Now pull geolocation" +tega_end_time+ "");
                                        alarmON();
                                        clearInterval(x);
                                    } 
                            }, 1000);
                        }

可能有什么问题吗？请帮忙..我收到错误消息，表明getCurrentPosition未定义